Practice online oracle dba quiz

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I am presenting here the Oracle DBA quiz. I hope you like it

This Oracle DBA online test check the understanding on various topics like RMAN, Oracle Structures,Backup & recovery , Oracle Memory structure, Background processes, Dictionary views , alert logs ,oracle tablespace ,indexes , profiles and many more

The below test is randomized Oracle DBA quiz and select 40 questions from the set of many questions,so each time you try to attempt it, you will get different questions in different order and option would also be in different order, So it will be fun practicing with this tool. You can try as many times as you want till you feel comfortable about it

Instructions for online test

1.This quiz consists of 40 questions .It is recommended to complete the test in 60 min
2. It consists both single choice and more than one choice questions to test your knowledge
3. You can press the submit button at the end of your test and get the final score
4.You will also get the know the correct choice after you finished the test.

1. You issue the following statement from SQL*Plus: startup mount. Where does Oracle obtain values for starting the instance?

From your init.ora file or spfile

From the default settings in your redo log file

From the default settings for the tablespace

From Oracle default values in OS

Question 1 of 40

2. You are identifying dictionary objects in the Oracle database. Which of the following is a view in the data dictionary?

DBA_TABLES

V$DATABASE

EMP

SYS.AUD$

Question 2 of 40

3. Which one of the following RMAN commands is equivalent to the SQL statement ALTER DATABASE RENAME FILE ?

CHANGE

CATALOG

RENAME

SWITCH

Question 3 of 40

4. Which of the following clauses are available in alter user statements but not in create user statements?

identified by

temporary tablespace

profile

default role

Question 4 of 40

5. You need to remove a column from the database. Which of the following choices best identifies how to do so if your objective is to quickly execute the task without necessarily freeing up space in your tablespace?

truncate table

alter table set unused column

alter table modify column

alter table drop column

Question 5 of 40

6. You are implementing control file multiplexing. Which of the following choices identifies how Oracle knows the locations of the control files it is supposed to maintain?

Values specified for BACKGROUND_DUMP_DEST.

Oracle knows automatically where to look.

Values specified for CONTROL_FILES.

Values specified in V$DATABASE.

Question 6 of 40

7. We are designing the physical database layout on your host machine. What is the relationship between tablespaces and datafiles in the Oracle database?

Many tablespaces can share one datafile.

One tablespace has only one datafile.

One datafile can contain many tablespaces.

One tablespace can have many datafiles.

Question 7 of 40

8. After creating a new user for your Oracle database, a user still complains he or she cannot log in because of insufficient privileges errors. Which of the following actions should you take?

Grant the CONNECT role to the user

Grant create table privileges to the user

Reset the user's password

Unlock the user's account

Question 8 of 40

9. A organization is taking online backups of the database, with the database operating in ARCHIVELOG mode. Due to a media failure they lost the SYSTEM tablespace data files. What must they do to recover the data files?

Take the tablespace offline; restore the lost file, and issue the RECOVER DATAFILE command

Shut down the database, restore all the Oracle files, and open the database with the RESETLOGS option

Take the tablespace offline, restore the lost file, and issue the RECOVER TABLESPACE command

Shut down the database, restore the lost file, mount the database, and recover the database

Question 9 of 40

10. Session information when dedicated servers are being used is stored where in the Oracle database?

Large area

In the buffer cache keep area

In the shared pool area

In the redo log buffer

In the PGA

Question 10 of 40

11. Which one of the following RMAN views must you query to view the code of an existing stored script in the recovery catalog?

RC_STORED_SCRIPT_CODE

RC_SOURCE_SCRIPT

RC_STORED_SCRIPT

RC_STORED_SCRIPT_LINE

Question 11 of 40

12. You are processing an update statement. At what point in SQL statement processing is the data change actually made to block buffers?

When data is fetched from the cursor

When the cursor is opened

When the statement is parsed

When the statement is executed

Question 12 of 40

13. You are defining storage for various segment types in the Oracle database. Which of the following is not a valid type of segment in Oracle?

Sequence segment

Temporary segment

Undo segment

Data segment

Question 13 of 40

14. Which one of the following statements is incorrect with respect to RMAN's CROSSCHECK command?

It identifies the backup sets or image copies that are either corrupted or have been accidentally deleted.

It updates the non-availability of the files by updating the information in the recovery catalog with the appropriate status.

RMAN crosschecks the availability of the backup sets by verifying the information stored in its repository with the backup sets that are physically available.

RMAN automatically deletes information pertaining to the image copy from the repository if it is physically not available.

Question 14 of 40

15. You alter a tablespace’ s default storage settings in the Oracle database to increase the size of initial extents. Which of the following choices identifies when the change will take effect for tables that already exist in that tablespace?

The change will not take effect for existing tables.

The change takes effect immediately.

The change takes effect when data is added to the table.

The change takes effect when data is removed from the table.

Question 15 of 40

16. When choosing a character set and national character set, which of the following factors should not enter into consideration?

Oracle supports only English-like languages as its character set for entering SQL and PL/SQL commands

Your national character set and character set should be closely related where possible.

Your character set must either be US7ASCII or a superset of it.

You can use variable-length multibyte character sets as both character sets on your database.

Question 16 of 40

17. Which one of the following statements is incorrect about direct-path insert operations?

Direct-path insert enables you to copy data from one table to another table within the same database.

To load data using the serial mode, you must activate the direct-path insert by specifying the SERIAL hint.

Direct-path insert can be implemented either in the serial mode or the parallel DML mode.

It speeds up the insert operation, bypassing the buffer cache.

Direct-path insert can be performed when using the INSERT INTO... SELECT statement.

Question 17 of 40

18. Which of the following is the init.ora parameter that indicates the size of each buffer in the buffer cache?

BUFFER_SIZE

ROLLBACK_SEGMENTS

DB_BLOCK_BUFFERS

DB_BLOCK_SIZE

Question 18 of 40

19. You issue the following statement in Oracle:
CREATE UNIQUE BITMAP INDEX empl_lastname_indx_01
ON employee (lastname ASC);
What is wrong with this statement for dictionary-managed tablespaces?

You cannot use the nosort keyword in creating an index.

You should omit the asc keyword.

Bitmap indexes cannot be unique.

The tablespace clause must be omitted.

Question 19 of 40

20. Which two of the following items are required for killing a user session?

Password

SID

Username

Serial number

Question 20 of 40

21. To allocate another role to a user, which command is most appropriate?

alter database

alter system

alter user

grant

Question 21 of 40

22. User JOHN has create any table privilege with administrative abilities on that privilege. Which of the following statements show how to revoke the administrative component from JOHN without limiting her overall ability to create tables?

None of these

revoke admin option from create any table;

revoke create any table from JOHN; then grant create any table to JOHN;

revoke admin option from create any table; then grant create any table to JOHN;

Question 22 of 40

23. During regular database operation, which background process will take smaller blocks of free space in a dictionary-managed tablespace and move things around to make bigger pieces of free space?

ARCH

SMON

PMON

LGWR

DBW0

Question 23 of 40

24. You want to perform some maintenance and You issue the shutdown command at 9 p.m. on a Saturday. One hours later, the database is still in the process of shutting down. Which of the following options did you most likely use in order to shut down the database?

shutdown normal

shutdown transnational

shutdown abort

shutdown immediate

Question 24 of 40

25. You are using locally managed tablespaces in Oracle. Which of the following choices best describes the way Oracle implements this feature in the database?

Using a bitmap in the space header segment

Using the data dictionary in a distributed database

Using the data dictionary on the local database

Using a flat file in the local directory storing the datafile

Question 25 of 40

26. Which one of the following statements is true while taking tablespace backups using RMAN?

RMAN does not require the tablespace to be in backup mode

You need to make the tablespace offline.

RMAN generates extra redo information during online backups when compared with user-managed online backups.

You need to keep the tablespace in backup mode explicitly.

Question 26 of 40

27. A DBA manages a database that is operating in NOARCHIVELOG mode. Which one of the following options should he include in his backup strategy?

Whole database backup while the database is open

Cannot perform any backups in this mode

Can only perform logical backups

Whole database backup after the database is gracefully closed

Question 27 of 40

28. You need to identify the remaining free space in a tablespace. From which of the following views would you get this information most easily?

DBA_EXTENTS

V$TABLESPACE

DBA_FREE_SPACE

DBA_TABLESPACES

Question 28 of 40

29. You are about to drop a tablespace. Which of the following statements can be used for dropping tablespaces that contain parent tables in foreign key relationships?

alter database datafile offline drop

drop tablespace cascade constraints

alter tablespace offline immediate

drop tablespace including contents

Question 29 of 40

30. You want to find out the names and locations of all control files in your database. Which two of the following performance views would you query?

V$CONTROLFILE

V$PARAMETER

V$DATABASE

V$CONTROLFILE_RECORD_SECTION

Question 30 of 40

31. You are attempting to clear an unarchived redo log file. In order to manually enact a log switch, which of the following statements is appropriate?

alter system

alter user

alter redo log

alter database

Question 31 of 40

32. You have assigned 10 tables to the keep pool. How should you determine the appropriate size for your keep pool?

See also How to drop table in oracle

Based on the size of your shared pool

Based on the number of blocks in the table plus blocks in associated indexes

Based on the number of blocks in associated indexes only

No Answer is Correct

Based on the number of blocks in the table only

Question 32 of 40

33. Which of the following clauses in a create user statement restricts the number of tables a user can add to a tablespace?

default tablespace

identified by

profile

quota on

Question 33 of 40

34. You are working in an organization which is situated in many countries. You maintain databases in multiple countries in multiple languages. To determine the date conventions for a database in a particular country, you might use which of the following database views?

DBA_DATES

V$NLS_VALID_VALUES

V$NLS_PARAMETERS

NLS_DATE_FORMAT

Question 34 of 40

35. A User accidentally drops a very critical table. What kind of failure just occurred?

Process failure

Human error

Statement failure

Instance failure

Question 35 of 40

36. You are running Oracle in America in support of a financial analysis project for the government of Egypt. In order to produce reports that display money amounts as Egyptian pounds, rather than dollars, which of the following initialization parameters would be useful?

NLS_SORT

NLS_CURRENCY

NLS_DATE_FORMAT

NLS_LANG

Question 36 of 40

37. If you wished to make it so that every user in Oracle could have only one connection to the database at a time, which of the following choices identifies how you would do it?

Set IDLE_TIME in the DEFAULT profile to 1

Set LICENSE_MAX_SESSIONS = 1 in init.ora

Set SESSIONS_PER_USER in the DEFAULT profile to 1

Set SESSIONS_PER_USER = 2 in init.ora

Question 37 of 40

38. When we issue the commit statement in the session, which of the following things will not occur?

Cached data is saved immediately to disk.

Acquired row or table locks are released.

Acquired undo segment locks are released.

Redo entry generated for committed transaction.

Question 38 of 40

39. You are considering using the MTS architecture on the Oracle database. Session information when shared servers are being used is stored where in the Oracle database?

In the shared pool

In the PGA

Large pool area

In the redo log buffer

In the buffer cache keep area

Question 39 of 40

40. Your Oracle EMP table contains many unique values in the FIRST_NAME column. You want to index that column to take advantage of this fact in query access. Which of the following indexes might you use?

reverse key index

Function-based index

Simple B-tree index

Bitmap Index

Question 40 of 40

I hope you like this Oracle DBA online quiz and it helps in your examination preparation. Best of Luck for the Oracle certification Examination. Please do provide feedback on it. We will also be adding more quizzes and questions in future.

Happy Learning!!!!

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